AUSTRALIAN SPECIES OF RHYTIDOPONERA MAYR 
69 
in length, slightly shorter than second, apical as long as the two preceding 
together. Eyes large and convex, placed just behind the middle of the sides. 
Thorax fully twice as long as broad, sutures well defined. Pronotum as long 
as broad, broader behind than in front, feebly convex transversely in front, 
flat or feebly depressed behind, giving the angles a raised appearance. Meso- 
notum one-third broader than long, oval, strongly convex transversely, 
epinotum convex transversely. Node barely one-third broader than long, 
almost straight behind, strongly convex in front, a longitudinal groove in 
middle of dorsum sharply impressed. In profile twice as high as long, sides 
parallel, the anterior face vertical, straight above, concave below, posterior 
straight, rounded into dorsum, the latter flat, sloping downward behind, 
anterior edge sharp, the ventral spine short, slender, parallel and sharp. 
Postpetiole fully one-fourth broader than long, strongly convex in front, on 
some specimens there is an indication of a median impression. First segment 
of gaster also broader than long, strongly convex behind. The constriction 
between the two segments sharp and deep. Legs long and stout. 
Male. — Length, 9- 5 mm. 
Reddish-brown, gaster darker, more brownish. Wings with a smoky 
yellowish tinge, nervures brown. 
Mandibles A^ery delicately striate longitudinally. Head rather coarsely 
punctate-rugose, the punctures large, shining at bottom, finely and densely 
reticulate between punctures. Pronotum finely and densely striate transversely 
with numerous shallow punctures. Centre of mesonotum and whole of 
scutellum coarsely punctate-rugose, the punctures large and deep, shining at 
bottom, front and sides of mesonotum rather coarsely reticulate. Epinotum 
striate-reticulate on top, strongly punctate on sides. Node and postpetiole 
shining, transversely striate, striae obsolete. First segment of gaster smooth 
and shining in front, some obsolete transverse striae behind. 
Hair yellow, long and erect throughout, short and adpressed on antennae 
and legs. 
Head fully one-fifth longer than broad, strongly convex behind the eyes. 
Mandibles with numerous very small sharp teeth. Clypeus broadly convex 
above and in front. Frontal area oblong, broader than long. Frontal 
carinae as long as broad behind, much narrower in front, with traces of a 
longitudinal carina between them, the carina strongest in front. Second 
segment of funiculus slightly shorter than scape and almost five times longer 
than first segment. Eyes convex, occupying barely one-third of the sides. 
Ocelli large and convex. Thorax barely twice as long as broad. Pronotum 
projecting in front of mesonotum below, strongly convex. Mesonotum as 
long as broad, strongly convex in front, straight behind, mayrian furrows 
deeply impressed in front, broad and obsolete behind, parapsidal furrows 
strongly, but not sharply, impressed, a deep, Avide and sharp longitudinal 
groove on anterior fourth. Scutellum one-fifth broader than long, anterior 
border and sides straight, posterior border strongly convex. Metanotum 
two and one-half times broader than long, strongly convex. Epinotum 
broadly convex transversely. In profile pro-mesonotal suture strongly 
impressed. Pronotum sloping downward and forward at an obtuse angle, 
feebly convex. Mesonotum strongly convex in front and above. Scutellum 
convex above, fully three times longer than high. Metanotum slightly higher 
than long, convex above. Dorsum of epinotum convex, rounded into declivity, 
the latter straight, at an obtuse angle, longer than dorsum. Node not 
distinct, broadest behind. In profile almost parallel, feebly convex from apex 
to base, the ventral spine slender and sharp, fully twice as long as broad at 
